858871985 has 8 divisors (see below), whose sum is σ = 1032405696. Its totient is φ = 685924720.

The previous prime is 858871973. The next prime is 858872039. The reversal of 858871985 is 589178858.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 858871985 - 2⁶ = 858871921 is a prime.

It is a super-2 number, since 2×858871985² = 1475322173235680450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143381 + ... + 149250.

It is an arithmetic number, because the mean of its divisors is an integer number (129050712).

Almost surely, 2^858871985 is an apocalyptic number.

It is an amenable number.

858871985 is a deficient number, since it is larger than the sum of its proper divisors (173533711).

858871985 is a wasteful number, since it uses less digits than its factorization.

858871985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293223.

The product of its digits is 6451200, while the sum is 59.

The square root of 858871985 is about 29306.5177904165. The cubic root of 858871985 is about 950.5525815675.

The spelling of 858871985 in words is "eight hundred fifty-eight million, eight hundred seventy-one thousand, nine hundred eighty-five".